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Abstract
The adsorption isotherms of Mg2+ on γ-alumina follow a typical Langmuir model, characteristic of single layer adsorption, and experimental data fitting is successfully described by a two-layer electrostatic model (DLM) on discrete sites on the surface with variable charge as a function of pH. Speciation studies indicate that Mg2+ was the major adsorbed species and the results show how chemical composition and species distribution in clay surfaces couples to solution properties such as pH and ionic strength to regulate adsorption and desorption processes in the distribution of Mg2+ species between sediment and the aqueous phase. Probably the mechanism of adsorption of Mg2+ at the γ-alumina surface is predominantly electrostatic, with outer sphere complexation, and the Mg2+-saturated γ-Al2O3 surface efficiently promotes hydrolysis of phosphate diesters.
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